Question about Cisco CVA 122 (CVA122-SINGLE-1P) Modem

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Cisco cva 122

I want to open port/gate 21 for a ftp server at my home but the cisco is blocking my acces..

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Re: cisco cva 122

PAT/NAT has to be configured to forward port 21 to your PC's IP address.
Have you had a look in the config/management page? If it supports this, it'll be there...

Posted on Feb 23, 2010

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Port 80 is the web port. Whenever you look at a web page you are going to port 80 on the server. If you block port 80 then you won't see web pages. I am assuming it's outgoing traffic to web servers you wish to block. A standard router will have incoming port 80 blocked by default. You would OPEN port 80 if you had a web server at home.

Feb 22, 2015 | Apache Micro Peripherals Modems

3 Answers

Windows home server remote access - cant get it to work

It's probably not about RDP. I think we are talking about the homeserver remote access that allows you to up/download stuff to/from yourshares, run the server console or remote control a workstation in your homenetwork from outside (from the internet).

The whole procedure is a little complex. In short, you have to:
- start remote access in the WHS console (settings - remote access)
- create and configure a dyndns domain name (or something similar) to find your server from outside
- configure the user profiles to allow remote access. They need to have "strong" passwords.
- forward the port numbers 80, 443 and 4125 to the servers IP address on your internet router.
- forward the port 3389 too, in case you want to use the RDP protocol to access the servers remote desktop.

That should be it.
If you have several routers in your net, you have to forward the ports from the first one to the second and from there to the home server.

Since we don't know where exactly you are stuck, you should post a little more information.

Hope this helps.

Nov 06, 2009 | Modems

1 Answer

Problem downloading files up to 100 mb

Well, here's a bit complicated, yet effective method that just might reduce your downloading headaches... Let's say you're connect to the Internet using a 28.8K modem and that your Internet service provider lets you telnet to their server. Of course, your provider's server can download files much faster, so the idea here is to download the file to their server at high speed, split it, and retrieve parts at the highest speed you can to your provider's server. Generally speaking, this method not only is a faster way to download files, but it is also a more reliable method since you'll be downloading many smaller files rather than one large file.
First, find out the FTP address of the large (larger than 16M for example) file that you want to download. For example:
Telnet to your Internet service provider's server.
From within the telnet session, download your file to your provider's server. Following is a "screen shout" of a sample file transfer on an UNIX compatible server. Blue/bold text represents your input.
ftp> open
Connected to
220 ftp x.cpm FTP Service (Version 2.0).
User ( anonymous
331 Anonymous access allowed, send identity as
ftp> binary
200 Type set to I.
ftp> get
200 PORT command successful.
150 Opening BINARY mode data connection for
226 Transfer complete.
ftp> quit
221 Thank you for using! Once the file is download to the server, the next step is to divide the file into smaller pieces so that you will not waste too much time downloading should your Internet dial-up connection go down.
split -b 2000b
You're almost there! Now simply log off from your telnet session and start downloading (from your provider's server to your computer) smaller files (not the which the above split command (on most UNIX compatible machines) created.
Once you have all the files, simply merge them and you got a good copy of the original If you're using DOS or Windows, you can merge files using the following command (assuming that (16000 byte file) was divided into 8 2000 byte files named xaa to xah):
copy /b xaa xab xac xad xae xaf xag xah
Don't forget to log back into your Internet service provider's computers and delete temporary files ( and xaa..xah) once you've made sure that your downloaded copy is in good condition. Doesn't sound like the above steps could make your downloads faster or more reliable? Well, in most cases it does; specially if the file you're downloading is rather large. The reason why this method could possibly be faster is because you can download files from your provider's computer to your computer faster than from most remote sites. Of course, the reason for reliability is that downloading many smaller files makes it possible to resume a download without wasting as much time as resuming a larger file download would.
You can use FRESH DOWNLOAD.Fresh Download is an easy-to-use and very fast download manager software that turbo charges downloading files from the Internet, such as your favorite freeware/shareware, mp3 files, movie files, picture collections, etc. Unlike any other similar utilities, this software is 100% free, no charges, no banners in the software (whichsteal your bandwidth), no spyware.

Apr 13, 2009 | Arris Touchstone 450a (CM450) Modem

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Can not connect to the ftp from outside the LAN network in the browser only works in house! Need to set up the DM602 for web connection. Server is a Mac running OS X 10.4 using Rumpus 5.

this is probably to do with the firewall on your router.

you will need to setup up port forwarding on your router to let you gain access from the outside world

please rate this answer if it has been useful



Mar 23, 2009 | NetGear DM602 ADSL-Modem

1 Answer

Cannot connect to Remote Desktop at Work From Home

there is a ver 5.06 of the client out by now, it is even win7 compatible, perhaps try upgrading to that version.

yes, there have been issues reported with early 5.0x and he was correct to test an older stable version.
The VPN tunnels work the same way with either version, therefore I would rule out your modem to be an issue.

Mar 17, 2009 | Siemens SpeedStream Modem (4100) (SS4100)

1 Answer

Motorola Router SBG900i blocks download from particular server

The best page for portforwarding can be found here.
It mainly depends on the software and the ports used, so it might differ from application to application. has excellent user guides.

Jan 07, 2009 | Arris SURFboard 2.4GHz Wireless Cable...

2 Answers

The LImeWire program and routers


check with the ISP person ,in there server tcp ports are enabled ,
in some ISP they there ports are open ports,
sume isp are block the some ports so pls first check with ISP provider side, why means limewire need the port as to open ,

in your pc windows firewall will not block any ports

Aug 31, 2008 | D-Link Modems

1 Answer

RCA Modem DCM315R

Just a bit of explanation. E0 interface is for inside network (LAN interface). E1 is for outside (ISP or WAN physical interface). Dialer1 is for PPPoE (the "actual"/logical WAN interface). The is ISP provided static IP address for the use of the server. This configuration example is for running FTP server, which uses the standard TCP port 20 and 21.

The LAN uses network with subnet for both servers and workstations. All servers within the LAN use static IP address. The router is configured as DHCP server to give out IP info (IP addresses, subnet mask, DNS) to workstations that are configured as DHCP client.

Basically I suggest that you deploy NAT (Network Address Translation) and PAT (Port Address Translation) to setup your own servers behind Cisco router. The NAT is used to translate the ISP's given static IP address to your local IP address. The PAT is used to translate TCP ports (the port 20 and 21) between the two IP addresses.

When using NAT/PAT, keep in mind that the Internet-accessible servers are seen from the Internet as their NAT/PAT-ed IP address (the Public IP address) and not the local IP address (not the Private IP address). This understanding is very important when you or someone need to test connectivity to the server and/or when you need to create filter (access list or ACL for short) to allow only certain incoming traffic from the Internet and block others.

Side Note:
For more info on NAT/PAT concept, check out the following FAQ
»Cisco Forum FAQ »NAT and PAT; Introduction and Implementations

Instruments used in this illustration are pretty much standard for running your own servers. Please note that IP addresses, username, and password are changed. However, you could always modify the configuration to suit your situation.

This sample configuration assumes that you have a block of IP from ISP. There is a dedicated Public IP address for the router WAN interface (the Dialer1 interface) and another dedicated Public IP address for the server PAT IP address. If you only have a single Public IP address for both router WAN interface and server PAT IP address, there are several ways to configure the router.

One way is to use the same command as shown in sample configuration.

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  1. ip nat source static tcp 21 21 extendable
ip nat source static tcp 21 21 extendable
This one configuration way is suitable when you have static IP address from your ISP and you know exactly what the IP address is. In this case you have the single static IP address for both the WAN interface and Public server IP address.

When you are unsure which IP address you receive from the ISP, or when your Public IP address keep changing; then another way to configure the static PAT is following

view plaincopy to clipboardprint?
  1. ip nat source static tcp 21 interface Dialer1 21 extendable
ip nat source static tcp 21 interface Dialer1 21 extendable
With situation of dynamic IP address, at some point you still need to know the exact Public IP address you receive from your ISP for server connection testing and production time. To find out, you can issue show ip interface brief command on the router. You will then see the associated WAN interface Public IP address.

Feb 25, 2008 | RCA Cable Modem DCM315R (11603540)

2 Answers

Modem security set up "" does not respond i have a virginbroadband modem and they e-mailed "roundcube"support but it does not help

How do I setup my own home network? Before setting up your own network, the type of network as well as what you wish for the .... All computers in house can share the same modem connection.
Home FTP server connection problem. Setup the Modem To forward the IP to the Router, .... Browsers and Internet, =====> Network, ===> Security, ===> Software, =====> Programming .

Good Luck/Please dont for get to Vote, Thank You.

Dec 18, 2007 | Modems

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